气候变化领域集成服务门户(CCPortal): High-performance light-emitting diodes based on carbene-metal-amides

CCPortal

DOI	10.1126/science.aah4345
	High-performance light-emitting diodes based on carbene-metal-amides
	Di D.; Romanov A.S.; Yang L.; Richter J.M.; Rivett J.P.H.; Jones S.; Thomas T.H.; Jalebi M.A.; Friend R.H.; Linnolahti M.; Bochmann M.; Credgington D.
发表日期	2017
ISSN	0036-8075
起始页码	159
结束页码	163
卷号	356 期号:6334
英文摘要	Organic light-emitting diodes (OLEDs) promise highly efficient lighting and display technologies. We introduce a new class of linear donor-bridge-acceptor light-emitting molecules, which enable solution-processed OLEDs with near-100% internal quantum efficiency at high brightness. Key to this performance is their rapid and efficient utilization of triplet states. Using time-resolved spectroscopy, we establish that luminescence via triplets occurs within 350 nanoseconds at ambient temperature, after reverse intersystem crossing to singlets. We find that molecular geometries exist at which the singlet-triplet energy gap (exchange energy) is close to zero, so that rapid interconversion is possible. Calculations indicate that exchange energy is tuned by relative rotation of the donor and acceptor moieties about the bridge. Unlike other systems with low exchange energy, substantial oscillator strength is sustained at the singlet-triplet degeneracy point. © 2017, American Association for the Advancement of Science. All rights reserved.
英文关键词	amide; carbene; chlorobenzene; copper; gold; metal; organic solvent; chemical compound; equipment; light; luminescence; performance assessment; quantum mechanics; absorption; Article; chemical structure; crystal structure; current density; density functional theory; environmental temperature; fluorescence; light emitting diode; luminescence; phosphorescence; priority journal; Raman spectrometry; relaxation time; solid state; spectroscopy; temperature
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243532
作者单位	Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, United Kingdom; School of Chemistry, University of East Anglia, Earlham Road, Norwich, NR4 7TJ, United Kingdom; Department of Chemistry, University of Eastern Finland, Joensuu Campus, Joensuu, FI-80101, Finland
推荐引用方式 GB/T 7714	Di D.,Romanov A.S.,Yang L.,et al. High-performance light-emitting diodes based on carbene-metal-amides[J],2017,356(6334).
APA	Di D..,Romanov A.S..,Yang L..,Richter J.M..,Rivett J.P.H..,...&Credgington D..(2017).High-performance light-emitting diodes based on carbene-metal-amides.Science,356(6334).
MLA	Di D.,et al."High-performance light-emitting diodes based on carbene-metal-amides".Science 356.6334(2017).